Whoops!

[nn5g]

    I was in the process of adjusting L3 & L4 after  installing the K160RX for max power, when I got a HI CUR indication, then lost  all power. The LCD does not light. Yes, I was using the plastic tool to adjust L3  & L4. I do have power on the board. I unplugged the 160 board, but nothing  changed. I never had to troubleshoot putting it together a year ago. Any  suggestions on where to start looking?  Tnx de NN5G
   
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[Don Wilhelm-3]

If you are using a Rigrunner with fuses for your DC power distribution,
check the fuse.  I recently was temporarily 'mind-boggled' by a similar
condition - measured full power supply voltage with no load, but as soon as
I connected a load, the voltage dropped to almost nothing.
Those LEDs across the fuse that are supposed to tell you that a fuse is
blown will conduct voltage with no current load (just like a diode) -
Unfortunately, the dim LED did not overpower my workbench lighting enough
for me to notice it (they only light when a load is applied).

73,
Don W3FPR

> -----Original Message-----
>
>     I was in the process of adjusting L3 & L4 after  installing
> the K160RX for max power, when I got a HI CUR indication, then
> lost  all power. The LCD does not light. Yes, I was using the
> plastic tool to adjust L3  & L4. I do have power on the board. I
> unplugged the 160 board, but nothing  changed. I never had to
> troubleshoot putting it together a year ago. Any  suggestions on
> where to start looking?  Tnx de NN5G
>

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[Ron D'Eau Claire-2]

Is it a K2 or K2/100. If a K2, how quickly did you try to restart it? The K2
has a resettable fuse in it that will open when stressed, then it needs a
short rest before it reconnects.

Ron AC7AC

-----Original Message-----
   I was in the process of adjusting L3 & L4 after  installing the K160RX
for max power, when I got a HI CUR indication, then lost  all power. The LCD
does not light. Yes, I was using the plastic tool to adjust L3  & L4. I do
have power on the board. I unplugged the 160 board, but nothing  changed. I
never had to troubleshoot putting it together a year ago. Any  suggestions
on where to start looking?  Tnx de NN5G
   



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[nn5g]

Don.... You hit the nail on the head. I assumed since I had 13.8 volts  at J3, I was OK on power. The more I use the RigRunner system, the less  I like it. Tnx for your help.... 73 from Paul NN5G
 
Don Wilhelm <[hidden email]> wrote:  If you are using a Rigrunner with fuses for your DC power distribution,
check the fuse.  I recently was temporarily 'mind-boggled' by a similar
condition - measured full power supply voltage with no load, but as soon as
I connected a load, the voltage dropped to almost nothing.
Those LEDs across the fuse that are supposed to tell you that a fuse is
blown will conduct voltage with no current load (just like a diode) -
Unfortunately, the dim LED did not overpower my workbench lighting enough
for me to notice it (they only light when a load is applied).

73,
Don W3FPR

> -----Original Message-----
>
>     I was in the process of adjusting L3 & L4 after  installing
> the K160RX for max power, when I got a HI CUR indication, then
> lost  all power. The LCD does not light. Yes, I was using the
> plastic tool to adjust L3  & L4. I do have power on the board. I
> unplugged the 160 board, but nothing  changed. I never had to
> troubleshoot putting it together a year ago. Any  suggestions on
> where to start looking?  Tnx de NN5G
>

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1:12 PM


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[Don Wilhelm-3]

Paul,

I love the rigrunner system, but like anything else, it does have its
limitations and ecentricities.  An awareness of those ecentricities (learned
by experience) is a very good tool indeed.

73,
Don W3FPR
  -----Original Message-----

  Don.... You hit the nail on the head. I assumed since I had 13.8 volts at
J3, I was OK on power. The more I use the RigRunner system, the less I like
it. Tnx for your help.... 73 from Paul NN5G


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[stephen Farthing]

Hi NN5G,

        Almost the same thing happened to me on my standard K2. However I
did not trash the LCD. The cause was not transmitting into a dummy load; I
had it connected into the wrong antenna connector. The net result was I
trashed the pa transistors. You might wish to check them in your debugging.

Regards,

Steve

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Paul Kelly
Sent: 02 December 2006 00:02
To: [hidden email]
Subject: [Elecraft] Whoops!

    I was in the process of adjusting L3 & L4 after  installing the K160RX
for max power, when I got a HI CUR indication, then lost  all power. The LCD
does not light. Yes, I was using the plastic tool to adjust L3  & L4. I do
have power on the board. I unplugged the 160 board, but nothing  changed. I
never had to troubleshoot putting it together a year ago. Any  suggestions
on where to start looking?  Tnx de NN5G
   
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[Darwin, Keith]

I'm building a Rev D KPA100.  During the final resistance checks (p.43) I got 11.5 ohms for both Q1 base and Q2 base.  The manual 11-16 ohms for Q1 and 12-16 ohms for Q2.  So Q1 is OK but Q2 is out of spec?
 
This resistance table was changed by the eratta.  Before that it said 12-16 for both transistors.  I'm thinking this is a documentation error and it should say 11-16 for both but before I apply power I figured I should check.
 
- Keith N1AS -
- K2 5411.ssb -
 
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[Jim K4ZMV]

Keith,

I measured the same thing on my KPA100 which I finished two weeks ago.  It
works fine.

73,

Jim, K4ZMV


----- Original Message -----
From: "Darwin, Keith" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, December 02, 2006 8:21 AM
Subject: [Elecraft] KPA100 - Q2 resistance check error - Problem?


I'm building a Rev D KPA100.  During the final resistance checks (p.43) I
got 11.5 ohms for both Q1 base and Q2 base.  The manual 11-16 ohms for Q1
and 12-16 ohms for Q2.  So Q1 is OK but Q2 is out of spec?

This resistance table was changed by the eratta.  Before that it said 12-16
for both transistors.  I'm thinking this is a documentation error and it
should say 11-16 for both but before I apply power I figured I should check.

- Keith N1AS -
- K2 5411.ssb -

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[Don Wilhelm-3]

Kieth,

Since the base circuit for Q1 and Q2 is quite symmetrical, there is no
reason to have a different resistance reading on one as opposed to the
other.  Neither Q1 nor Q2 should conduct with a resistance check, you should
be measuring the resistance of the other circuit elements and not the health
of either Q1 or Q2.

Ron can speak better than I for the reason the values are listed
differently, but I do suspect it was an oversight.

73,
Don W3FPR

> -----Original Message-----
>
> I'm building a Rev D KPA100.  During the final resistance checks
> (p.43) I got 11.5 ohms for both Q1 base and Q2 base.  The manual
> 11-16 ohms for Q1 and 12-16 ohms for Q2.  So Q1 is OK but Q2 is
> out of spec?
>
> This resistance table was changed by the eratta.  Before that it
> said 12-16 for both transistors.  I'm thinking this is a
> documentation error and it should say 11-16 for both but before I
> apply power I figured I should check.
>
>

--
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Checked by AVG Free Edition.
Version: 7.5.430 / Virus Database: 268.15.3/562 - Release Date: 12/1/2006
1:12 PM

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[Ken Wagner K3IU]

Check the errata sheet.
73,
Ken K3IU

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Darwin, Keith
Sent: Saturday, December 02, 2006 8:21 AM
To: [hidden email]
Subject: [Elecraft] KPA100 - Q2 resistance check error - Problem?

I'm building a Rev D KPA100.  During the final resistance checks (p.43)
I got 11.5 ohms for both Q1 base and Q2 base.  The manual 11-16 ohms for
Q1 and 12-16 ohms for Q2.  So Q1 is OK but Q2 is out of spec?
 
This resistance table was changed by the eratta.  Before that it said
12-16 for both transistors.  I'm thinking this is a documentation error
and it should say 11-16 for both but before I apply power I figured I
should check.
 
- Keith N1AS -
- K2 5411.ssb -
 
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[Ron D'Eau Claire-2]

Yep, that's one that got by me. The original resistance spec for Q1 base to
ground was 12 to 16 ohms but some units came in right at 12 ohms so the
engineer moved the spec to 11 to 16 ohms.

Somehow one of the numbers in the table didn't get changed. That my error.
They both should be 11 to 16 ohms!

So your unit is fine Keith; it's the manual that needs fixing.

Ron AC7AC


-----Original Message-----

Kieth,

Since the base circuit for Q1 and Q2 is quite symmetrical, there is no
reason to have a different resistance reading on one as opposed to the
other.  Neither Q1 nor Q2 should conduct with a resistance check, you should
be measuring the resistance of the other circuit elements and not the health
of either Q1 or Q2.

Ron can speak better than I for the reason the values are listed
differently, but I do suspect it was an oversight.

73,
Don W3FPR

> -----Original Message-----
>
> I'm building a Rev D KPA100.  During the final resistance checks
> (p.43) I got 11.5 ohms for both Q1 base and Q2 base.  The manual 11-16
> ohms for Q1 and 12-16 ohms for Q2.  So Q1 is OK but Q2 is out of spec?
>
> This resistance table was changed by the eratta.  Before that it said
> 12-16 for both transistors.  I'm thinking this is a documentation
> error and it should say 11-16 for both but before I apply power I
> figured I should check.
>
>

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[Darwin, Keith]

Much thanks to you guys for the answer.  I can now proceed with confidence.
 
73!
 
- Keith N1AS -

________________________________

From: Ron D'Eau Claire [mailto:[hidden email]]
Sent: Sat 12/2/2006 11:50 AM
To: [hidden email]; Darwin, Keith; [hidden email]
Subject: RE: [Elecraft] KPA100 - Q2 resistance check error - Problem?



Yep, that's one that got by me. The original resistance spec for Q1 base to
ground was 12 to 16 ohms but some units came in right at 12 ohms so the
engineer moved the spec to 11 to 16 ohms.

Somehow one of the numbers in the table didn't get changed. That my error.
They both should be 11 to 16 ohms!

So your unit is fine Keith; it's the manual that needs fixing.

Ron AC7AC


-----Original Message-----

Kieth,

Since the base circuit for Q1 and Q2 is quite symmetrical, there is no
reason to have a different resistance reading on one as opposed to the
other.  Neither Q1 nor Q2 should conduct with a resistance check, you should
be measuring the resistance of the other circuit elements and not the health
of either Q1 or Q2.

Ron can speak better than I for the reason the values are listed
differently, but I do suspect it was an oversight.

73,
Don W3FPR




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